package com.koko.aspect;

import com.koko.annotation.AutoFill;
import com.koko.constant.AutoFillConstant;
import com.koko.context.BaseContext;
import com.koko.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("@annotation(com.koko.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");

        // 获取操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        // 获取当前被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据不同的操作类型，进行不同的赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,
                        LocalDateTime.class);
                Method setCreateUserId = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER_ID,
                        Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,
                        LocalDateTime.class);
                Method setUpdateUserId = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER_ID,
                        Long.class);
                // 通过反射给对象属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUserId.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUserId.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,
                        LocalDateTime.class);
                Method setUpdateUserId = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER_ID,
                        Long.class);
                // 通过反射给对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUserId.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
